Engine Preheater

The study was carried out on a direct injection diesel engine (1896 cm³, 66 KW at 4,000 rpm).

Three journeys were considered: 3.2 km, 15 km and 34 km with an ambient temperature of +25°C.

Pollution and total consumption weighted without a engine heater with an outdoor temperature of 25°C.

CO emissions (g/km)

HC emissions (g/km)

Consumption (litres/100 km)

For 3.2 km

0.131

0.794

5.87

For 15 km

0.042

0.184

5.21

For 34 km

0.024

0.084

4.97

Pollution and total consumption weighted with a Carlor engine heater at an engine temperature of 50 °C.

CO emissions (g/km)

HC emissions (g/km)

Consumption (litres/100 km)

For 3.2 km

0.072

0.666

5.50

For 15 km

0.027

0.155

5.08

For 34 km

0.018

0.071

4.93

Gains thanks to preheating the engine to 50°C using the Carlor engine heater

HC emissions (%)

CO emissions (%)

Consumption (%)

For 3.2 km

45.04

16.12

6.3

For 15 km

35.71

15.76

2.5

For 34 km

25

15.48

0.8

For HC and CO: Pollution during the initial seconds represents the main share of thepollution emitted during the journey. This share is particularly high for start-ups at low temperatures. The pollution emitted during the journey is not proportional to the length of the journey, as the weighting of the initial seconds is decisive.

The decrease in pollution levels over the initial kilometres was impressive: 45.04% for HC and 16.12% for CO!

It is important to remember that the study was carried out at an outdoor temperature of +25°C, while the mean temperature in Belgium is +10°C… There can be no doubt that in most cases, the decrease in pollution levels achieved thanks to the Carlor preheater will be far higher than the above figures.

Study no. 2: Reducing consumption

The results of the following tests were achieved on a direct injection diesel truck engine, with the following characteristics:

2. Reduction in consumption due to the rise in temperature of the diesel with the Carlor engine heater

The improved performance indicated below was calculated by extrapolating between the temperatures of -10°C and + 60°C based on linear regression. This reflects the reality in an optimised manner.

Fuel savings based on the increase in diesel temperature.

Fuel consumption will decrease as fuel temperature increases. Therefore, with a mean annual temperature in Belgium of 10°C, if we increase the temperature of the diesel by 40°C, fuel consumption will decrease by 1.24% when compared with mean consumption levels for the engine.

These tests provided us with ballpark figures for savings. Let us consider the example of a truck driving for 8 hours per day over 200 days each year, with a mean outdoor temperature of + 10°C. The following savings would be achieved in this case: